#!/bin/bash

set -e

echo "[+] Finding latest snapshot..."
latest_snapshot=$(ls /media/storage/backup/snapshots | sort | tail -n1)
passphrase=$(rage -d -i /media/storage/backup/static-passphrase-key /dev/shm/backup-passphrase)

echo "[+] Creating new snapshot..."
new_snapshot=$(date -Iminutes)
btrfs subvolume snapshot -r '/media/storage/backup/data' "/media/storage/backup/snapshots/$new_snapshot"

echo "[+] Encrypting new snapshot..."
btrfs send \
  -p "/media/storage/backup/snapshots/$latest_snapshot" \
  "/media/storage/backup/snapshots/$new_snapshot" \
  | zstd - \
  | simple-age-encryptor "$passphrase" \
  > "/media/storage/backup/repo/$new_snapshot.zstd.age"

echo "[+] Done!"